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Yes. The X carrying sperm (which are the sperm that make females) live longer than the Y carrying sperm (which are the sperm that make males).
However, the Y sperm swim faster, so the chances are equally good that you will get a girl or a boy. If the Y sperm swim fast enough before they die to fertilize the egg, then you'll have a boy. If the Y sperm don't reach the egg before they die, chances are an X sperm will get there shortly, and then you'll have a girl.
XX makes a girl, XY makes a boy all eggs contain an X chromosome, so sperm donates either an X or Y chromosome.

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9y ago

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